Phonics Boost is 80 moderately paced lessons for students in grades 2 and 3 with mild, moderate, or significant decoding skills weaknesses, and for students in grades 4 -12 (and adults) with significant decoding skills weaknesses. The vocabulary spans from easy to challenging words, making these lessons appropriate for students in grades 2 and higher. The recommended group size is 6-12 in grades 2-3 , and 4-6 in 4th grade and higher.